Rotary pump.



PATENTED MAR. 29, 1904.

H. E. DECKBBAGH.

ROTARY PUMP.

APBLICATION FILED APR. 13, 1900.

2 SHEETS-SHEET l.

No MODEL;

No. 755,631. `PATENTE) MAR. 29, 1904. H. B. DECKBBACH. ROTARY PUMP.

. APPLICATION FILED APR. 13, 1900.

N0 MODEL. 2 SHEETS-SHEET 2.

FEIS I a www www M# @WW lthe iuid as it enters the port.

HENRY E. DECKEBACH,

Patented March 29, 1904. l

FFICE.

OF CINCINNATI, OHIO.

ROTARY PUMP.

SPECIFICATION forming part of Letters Patent No. 755,631, dated March 29, 1904.

Application fue@ April is, 1900.

To all whom it may concern:

Be it known that I, HENRY E. DEoKEBAoH, a citizen of the United States of America, and a resident of Cincinnati, in the county ofvHamilton and State of Ohio, have invented certain lates the pressure of the iiuid at discharge and when the pressure exceeds a certain limit cuts out the current from the motor and whose .induction-port is provided with means for preventing foreign substances from entering the pump and for observing the condition of This object is attained by the means described in the annexed specification and illustrated in the accompanying drawings, in which- Figure 1 is a front elevation of a rotary pump with the by-pass and valve for controlling it embodying my invention. Fig. 2 is a similar view showing the by-pass and the valve for controlling it in longitudinal central section. Fig. 3 is a side elevation of the pump and an electric motor mounted upon the same bed and having a shaft in common, the dotted lines showingl a means of coupling the shafts of the motor and the pump together when the same are not, as they are shown in full lines, formed integral. Fig. 4: is a detail front elevation of the pump, with the head-plate removed, upon an enlarged scale, showing the manner of mounting it upon the same bed with the motor. Fig. 5 is a detail elevation of the electric cut-out and the modified valvecase used with it. Fig. 6' is a sectional view of same upon `an enlarged scale.

Referringto the parts, within cylindrical box A is seated a loose internally-toothed ring B, which is rotated by pinion C, whose shaft c is journaled in a journal-box a, formed in head-plate a', and extends rearwardly through a journal-box c in the bottom of the boX A, to the interior ofwhich between the pinion Serial No. 12,669. (No model.)

and the ring is secured a plate a2 in shape of a lune, with its ends cut oif to form chambers co3 and between the ring, the pinion, and said ends. The head-plate has an induction and a discharge port c5 and a6 to register with chambers co3 and c. Now if pinion C be rotated toward the left, Fig. 4:, fluid will be drawn under suction into chamber a3 through port a5, part of it carried around between the pinion and the lune and part between the ring and the lune into chamber ai, from which it will be discharged under pressure through port c6. Pinion C is made of a diamater such that, chambers a3 and c are situated in the upper half of cylinder A and that the arc of the greater circle of the lune is greater than a semicircle. By reason of this construction the pinion when rotating toward the left keeps the teeth of the ring in contact with the right half of the lune, even though the teeth become worn, and thus prevents, first, any backlash of the iuid, and, second, the striking of the teeth of the ring against the left-hand corner of the lune.

Interposed between induction-port c5 and the pipe which conveys the fluid to the pump is a strainer K, which consists of two couplings Ze and 7c', between which a glass tube 702 is held by bolts 703 and 7a4. An oblong screen or strainer h5 covers the mouth of the coupling, into which the pipe which conveys the fluid to the pump is inserted for retaining foreign substances. The glass tube enables one to observe the condition of the iiuid as itenters the pump.

BOX A has standards a7 as, by which it is secured to a base-plate d, upon which an electric motor D is mounted. Shaft c of the pump also constitutes the shaft of the electric motor, as shown in full lines, Fig. 3, or the shafts of the pump and the motor may have attached to them clutches c2 and 03, whose teeth interlock, as shown in dotted lines, Fig. 3. As is seen in Fig. 3, by reason of the small diameter of pinion C it may be run at as high a speed as the shaft of the motor.

To regulate the pressure and the rate of discharge, the following means are used: Between the induction and the discharge ports a5 and a6 is a by-pass whose opening and closing is controlled by a valve E. The part of the by-pass IOO leading from the discharge-port a leads up beneath the valve-seat and the part a", leading to the induction-port, is above the valve-seat. Communicating with port a and port a are pressure-indicators H H to indicate the pressure at the induction and the discharge ports. The lower eXternally-screw-threaded portion aloof the valve-case,together with theby-pass, are formed integral with the head-plate a of the pump. Valve E has an upward-projecting annular flange or cup e, with Wings e', which bear against the walls of the lower part am of the case to guide the valve to its seat. Within the cup is seated the lower part @2 of the Valve-stem, which is screw-threaded to fit into the upper part e3 of the stern. Between the parts and e3 a rubber disk e* is held s e.- cured. Valve E is held to its seat by a coiled spring S, which is held between collar e3 upon the valve-stem and a disk e5, which h as a downwardly-projecting annular lug e, into which the upper end of the valve-stem projects. Sur rounding the valve-stem and the spring is a cylindrical casing F, having an enlarged and internally-screw-threaded portion at its lower end to fit over the lower portion am of the valve-case. Between case F and the portion al of the valve-case is aloose ring e7, which holds the rubber disk e4 in place when case F is screwed down in place. When the valve is raised from its seat, the rubber disk assumes a concave form,as shown in dotted lines in Fig. 2. The tension of spring S is regulated by a hand-screw f2, which passes through the head of case F and bears down upon disk e5. After springS has been set at the desired tension by .lowering or raising screw f2 it is locked by lock-nut f3.

In Figs. 5 and 6 is shown a form of valvecase and valve-stem modified to form the means for automatically cutting out the current from the motor when the valve is raised from its seat. Case F is cut away in the center, leaving the upper part 7"4 and the lower, f5, connected by two ribs f6 at diametrically opposite sides, and between the top of the lower portion am of the case and the top of case F is inserted a glass tube f7, with annular lugs f8 and f 9 to receive the severed ends g g of one of the wires connecting the rheostat (not shown) to motor D. G Within tube f7 upon valve-stem e3 rests a glass disk e7, upon which rests a copper cylinder es, upon the upper end of which rests a glass ring e9 and upon that a copper disk el", with a screw-threaded stem extending down through ring e and being tapped into cylinder e. Upon disk @lo rests another glass disk e, upon the top of which spring S bears down. When the valve is held to its seat, end g of the wire abuts against the lower edge of cylinder es, just above glass disk e7, and end g abuts against copper disk ew, just above glass ring e9, and the current from the rheostat to the motor is uninterrupted; but when the valve is thrown from its seat glass disk e7 abuts against the end g of the wire and glass ring e9 against end g', cutting out the current from the motor.

What I claim is- The combination of a rotary pump, an electric motor for rotating it, an induction and a discharge port in the pump, a by-pass connecting the ports, a valve controlling the opening and closing of the by-pass to be raised by a predetermined pressure at the dischargeport, an electric switch resting upon the valve, wires for conveying the motive power to the motor running into the switch and connected thereby when the valve is seated, and disconnected when the valve is raised from its seat, whereby when the .pressure exceeds a predetermined limit, the by-pass is opened for releasing the pressure and for decreasing the speed of the motor, substantially as shown and described. i

HENRY E. DECKEBACH.

Witnesses:

W. F. MURRAY, EMMA A. LYFORD. 

